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Like fractions are fractions with the same denominator. You can add and subtract like fractions easily  simply add or subtract the numerators and write the sum over the common denominator.
Before you can add or subtract fractions with different denominators, you must first find equivalent fractions with the same denominator, like this:
When working with fractions, the LCM is called the least common denominator (LCD). Click on the examples below.
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